Group VIII metal phosphine complexes-catalyzed addition of disilanes to allenic compoundsFormation of new organosilicon compounds containing both vinylsilane and allylsilane units
catalyst gave regioselectively new functionalized organosiliconcompounds, 2, 3-bis(organosilyl)prop-1-enes and 2, 3-bis(organosilyl)but-1-enes, respectively. Other group VIII metal-phospine complexes also affected the reaction, but results were found to be less satisfactory. Also, the reaction of any unsymmetrical disilane with an allenic compound gave only a single product; e.g., the addition of
将氯甲基-和甲氧基甲基乙硅烷X 3 - m Me m SiSiMe n -X 3 - n(X-Cl和OMe; m,n -0-2)以及六甲基乙硅烷添加到丙二烯和1,2-丁二烯中Pd(PPh 3)4的存在催化剂分别产生区域选择性的新型官能化有机硅化合物,2,3-双(有机甲硅烷基)丙-1-烯和2,3-双(有机甲硅烷基)丁-1-烯。其他族金属-膦配合物也影响了反应,但结果却不令人满意。同样,任何不对称的乙硅烷与烯丙基化合物的反应只能得到单一产物。例如,在Pd(PPh 3)4存在下向1,2-丁二烯中添加氯五甲基二硅烷,得到CH 2 -C(SiMe 3)CH(SiMe 2 Cl)Me,产率为93%。
New Cyclic and Polycyclic Ring Systems Containing Group 14 (Si, Ge, Sn) and 16 (S, Se, Te) Elements
作者:Uwe Herzog、Uwe Böhme、Gerd Rheinwald
DOI:10.1080/10426500108546568
日期:2001.1.1
The reactions of Me2MCl2 (M = Si, Ge, Sn), Si2Me4Cl2, Si2Me2Cl3, Si2Me2Cl4 and CH2(SiCl2Me)2, and suitable mixtures thereof, with H2S / NEt3 and Li2E (E = Se, Te) have been investigated and lead to a variety of new group 14 chalcogenide systems.
Addition of chloromethyl-and methoxymethyl-disilanes, as well as hexamethyldisilane, to allene and buta-1,2-diene in the presence of a Pd (PPh3)4 catalyst gave, regioselectively, new functionalized organosilicon compounds, 2,3-bis(organosily)prop-1-enes and 2,3-bis-(organosilyl)but-1-enes, respectively.
Double Silylation of 1,4-Bis(trimethylsilyl)butadiyne with Disilanes Using a Palladium Catalyst
作者:Tetsuo Kusumoto、Tamejiro Hiyama
DOI:10.1246/bcsj.63.3103
日期:1990.11
Reaction of 1,4-bis(trimethylsilyl)butadiyne with polychlorodisilanes Si2ClxMe6−x in the presence of a palladium catalyst gives, after methylation, 1,1,4,4-tetrakis(trimethylsilyl)butatriene and/or 1,1,2,4-tetrakis(trimethylsilyl)-1-buten-3-yne selectively. Hydrogenation, hydrosilylation, and oxidation of the obtained butatriene were found to take place at C(1)=C(2) double bond exclusively. The regioselectivity is ascribed to the geminally substituted silyl groups which sterically direct the attack of electrophile and stabilize postulated radical intermediates.
The reaction of methylchlorodisilanes with gem-polyhalides in the presence of organic bases has been investigated. The compounds CXCl2SiMeCl2 (X = Cl, H, F and SiMeCl2) were obtained in moderate to high yields from Cl2MeSiSiMeCl2 and polyhalomethanes (e.g., CCl4, CHCl3, CFCl3 and CCl3SiMeCl2) with PPh3 or Bu4NCl as catalyst. The reaction of 1,1,2-trichlorotrimethyldisilane with CCl4 afforded a 1 :